1 /* crypto/bn/bn_print.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
62 #include <openssl/buffer.h>
65 static const char Hex[]="0123456789ABCDEF";
67 /* Must 'OPENSSL_free' the returned data */
68 char *BN_bn2hex(const BIGNUM *a)
74 if (a->neg && BN_is_zero(a)) {
75 /* "-0" == 3 bytes including NULL terminator */
76 buf = OPENSSL_malloc(3);
78 buf = OPENSSL_malloc(a->top * BN_BYTES * 2 + 2);
80 buf=(char *)OPENSSL_malloc(a->top*BN_BYTES*2+2);
83 BNerr(BN_F_BN_BN2HEX,ERR_R_MALLOC_FAILURE);
87 if (a->neg) *(p++)='-';
88 if (BN_is_zero(a)) *(p++)='0';
89 for (i=a->top-1; i >=0; i--)
91 for (j=BN_BITS2-8; j >= 0; j-=8)
93 /* strip leading zeros */
94 v=((int)(a->d[i]>>(long)j))&0xff;
108 /* Must 'OPENSSL_free' the returned data */
109 char *BN_bn2dec(const BIGNUM *a)
115 BN_ULONG *bn_data=NULL,*lp;
117 /* get an upper bound for the length of the decimal integer
118 * num <= (BN_num_bits(a) + 1) * log(2)
119 * <= 3 * BN_num_bits(a) * 0.1001 + log(2) + 1 (rounding error)
120 * <= BN_num_bits(a)/10 + BN_num_bits/1000 + 1 + 1
123 num=(i/10+i/1000+1)+1;
124 bn_data=(BN_ULONG *)OPENSSL_malloc((num/BN_DEC_NUM+1)*sizeof(BN_ULONG));
125 buf=(char *)OPENSSL_malloc(num+3);
126 if ((buf == NULL) || (bn_data == NULL))
128 BNerr(BN_F_BN_BN2DEC,ERR_R_MALLOC_FAILURE);
131 if ((t=BN_dup(a)) == NULL) goto err;
133 #define BUF_REMAIN (num+3 - (size_t)(p - buf))
143 if (BN_is_negative(t))
147 while (!BN_is_zero(t))
149 *lp=BN_div_word(t,BN_DEC_CONV);
153 /* We now have a series of blocks, BN_DEC_NUM chars
154 * in length, where the last one needs truncation.
155 * The blocks need to be reversed in order. */
156 BIO_snprintf(p,BUF_REMAIN,BN_DEC_FMT1,*lp);
158 while (lp != bn_data)
161 BIO_snprintf(p,BUF_REMAIN,BN_DEC_FMT2,*lp);
167 if (bn_data != NULL) OPENSSL_free(bn_data);
168 if (t != NULL) BN_free(t);
178 int BN_hex2bn(BIGNUM **bn, const char *a)
182 int neg=0,h,m,i,j,k,c;
185 if ((a == NULL) || (*a == '\0')) return(0);
187 if (*a == '-') { neg=1; a++; }
189 for (i=0; isxdigit((unsigned char) a[i]); i++)
193 if (bn == NULL) return(num);
195 /* a is the start of the hex digits, and it is 'i' long */
198 if ((ret=BN_new()) == NULL) return(0);
206 /* i is the number of hex digests; */
207 if (bn_expand(ret,i*4) == NULL) goto err;
209 j=i; /* least significant 'hex' */
214 m=((BN_BYTES*2) <= j)?(BN_BYTES*2):j;
219 if ((c >= '0') && (c <= '9')) k=c-'0';
220 else if ((c >= 'a') && (c <= 'f')) k=c-'a'+10;
221 else if ((c >= 'A') && (c <= 'F')) k=c-'A'+10;
222 else k=0; /* paranoia */
241 if (*bn == NULL) BN_free(ret);
245 int BN_dec2bn(BIGNUM **bn, const char *a)
252 if ((a == NULL) || (*a == '\0')) return(0);
253 if (*a == '-') { neg=1; a++; }
255 for (i=0; isdigit((unsigned char) a[i]); i++)
259 if (bn == NULL) return(num);
261 /* a is the start of the digits, and it is 'i' long.
262 * We chop it into BN_DEC_NUM digits at a time */
265 if ((ret=BN_new()) == NULL) return(0);
273 /* i is the number of digests, a bit of an over expand; */
274 if (bn_expand(ret,i*4) == NULL) goto err;
276 j=BN_DEC_NUM-(i%BN_DEC_NUM);
277 if (j == BN_DEC_NUM) j=0;
284 if (++j == BN_DEC_NUM)
286 BN_mul_word(ret,BN_DEC_CONV);
299 if (*bn == NULL) BN_free(ret);
303 #ifndef OPENSSL_NO_BIO
304 #ifndef OPENSSL_NO_FP_API
305 int BN_print_fp(FILE *fp, const BIGNUM *a)
310 if ((b=BIO_new(BIO_s_file())) == NULL)
312 BIO_set_fp(b,fp,BIO_NOCLOSE);
319 int BN_print(BIO *bp, const BIGNUM *a)
324 if ((a->neg) && (BIO_write(bp,"-",1) != 1)) goto end;
325 if (BN_is_zero(a) && (BIO_write(bp,"0",1) != 1)) goto end;
326 for (i=a->top-1; i >=0; i--)
328 for (j=BN_BITS2-4; j >= 0; j-=4)
330 /* strip leading zeros */
331 v=((int)(a->d[i]>>(long)j))&0x0f;
334 if (BIO_write(bp,&(Hex[v]),1) != 1)